216620412 has 48 divisors (see below), whose sum is σ = 520071552. Its totient is φ = 70136640.

The previous prime is 216620399. The next prime is 216620423. The reversal of 216620412 is 214026612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100587 + ... + 102717.

It is an arithmetic number, because the mean of its divisors is an integer number (10834824).

Almost surely, 2^216620412 is an apocalyptic number.

It is an amenable number.

216620412 is an abundant number, since it is smaller than the sum of its proper divisors (303451140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216620412 is a wasteful number, since it uses less digits than its factorization.

216620412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2378 (or 2376 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 216620412 is about 14718.0301671114. The cubic root of 216620412 is about 600.5739064329.

It can be divided in two parts, 2166 and 20412, that added together give a triangular number (22578 = T₂₁₂).

The spelling of 216620412 in words is "two hundred sixteen million, six hundred twenty thousand, four hundred twelve".